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    <title>Document</title>
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    <script>
        let web={};//Oject
        let a={};
 //isPrototypeOf 表示 前面一个是否在后面web的原型链上,或者说是父级(长辈)
        console.log(Object.prototype.isPrototypeOf(web));

        //a.__proto__ == Object.prototype
        console.log(a.__proto__.isPrototypeOf(web));

        // //
        // console.log(Object.prototype.isPrototypeOf(web));
    </script>
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